Prep : Functional and Non-Functional requirements

Functional and Non-Functional Requirements

Functional Requirements.
Functional requirement specifies what the system should do
Functional requirements specify specific behavior or functions, for example:
“Display the heart rate, blood pressure and temperature of a patient connected to the patient monitor.”

  • Administrative functions
  • Authentication
  • Audit Tracking
  • External Interfaces
  • Reporting Requirements

Non-Functional Requirements
Non-functional requirement specifies how the system should behave
Non-functional requirements specify all the remaining requirements not covered by the functional requirements. They specify criteria that judge the operation of a system, rather than specific behaviors, for example: “Display of the patient’s vital signs must respond to a change in the patient’s status within 2 seconds.”

  • Performance – Response Time, Throughput, Utilization, Static Volumetric
  • Availability
  • Recoverability
  • Maintainability
  • Security
  • Data Integrity
  • Usability

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